06 450 crankcase crack

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Have an 06 with a cracked right case. For some reason you have to buy the set of left and right from all the places I have checked. Why? Are they machined to match? Could I get a used right off ebay and use it with my good left side?

Thanks,

Cy

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Have an 06 with a cracked right case. For some reason you have to buy the set of left and right from all the places I have checked. Why? Are they machined to match? Could I get a used right off ebay and use it with my good left side?

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To elaborate, crankcases are made in two steps. The center joint and the threaded holes used to bolt them together are done first (other operations may be done concurrently), but none of the shaft bores are cut. Then, the cases are bolted together and the bores for the shafts that run through both cases are bored while the cases are mounted in the same jig fixture. This ensures that the axis of all the bearing pockets are square with each other from one side to the other, and each is parallel to the other shafts.

With modern machining techniques, it would actually be possible to precisely do this job one case at time, but it is still far simpler to line bore them as a set.